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Yes they are extendable, you would need the RGB-60 which is For 60~80cm long tanks.

But the leds are gradually ramping to 100% over the 5 hour period before so still getting plenty of light, I may increase the static period if needed but atm all plants growing well and red plants looking redder than with the T5's.

My regime looks like this: Dawn - 9:00 - 12:00 (white 5%, blue 60%) Sunrise - 14:00 - 19:00 (white 100%, blue 100%) Sunset - 20:30 - 21:30 (white 10%, blue 60%) Dusk - 21:30 - 22:30 (white 0%, blue 05%)

I have mine on 5% blue overnight, can't see it causing any problems.

Yes more white would equal more intensity. The white and blue leds are adjustable in 5% increments. You can download the manual here : https://www.juwel-aquarium.co.uk/out/media/dlc/Beleuchtung/HeliaLuxLED_Control/GB_HeliaLux_Control_Manual.pdf

Could you put up a picture of the lights we may be able to identify them?

A pair of Radion Ecotech XR15's would be my first choice or failing that a couple of TMC Aquagro tiles.

Why not go for the Dennerle Scapers LED?

I made my own led light unit and have had similar problems. In my case the unit was getting damp and individual leds were failing the result was all other leds were lit but very dim and sometimes flickering.